CN116416929B - LED display system data feedback control method - Google Patents
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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Abstract
The invention discloses a data return control method of an LED display system, which comprises the steps that a controller adjusts the signal level of a bidirectional transmission control port to enable the data transmission directions of a bidirectional buffer to be opposite; the controller sends a data return instruction, the LED driving chip is switched to a data return state, and information data of the LED driving chip is transmitted back to the controller through the serial data input SDI port and the bidirectional buffer through continuous transmission of a data clock DCLK signal and a latch LE signal, so that a data return function is realized. According to the invention, on the basis of only adjusting one PCB wiring, the input/output ports of the LED driving chip are respectively switched in input/output through the instruction, so that the chip data information can be reversely transmitted back to the controller, the control state information and fault information of the LED driving system are effectively and cost-effectively returned, and the improvement of the performance of the LED display system and the convenience for later maintenance are facilitated; the invention can also realize data communication among a plurality of LED driving chips.
Description
Technical Field
The invention relates to the technical field of LED drive integrated circuits, in particular to a data feedback control method of an LED display system.
Background
The LED has the advantages of long service life, high luminous efficiency, high brightness, quick switching, high dynamic contrast display, wide color gamut and the like, and is widely applied to the display field. Recently mini LEDs have also been used for matrix backlight driving of liquid crystal displays. The rapidly developed LED displays require the LED driving chip to have richer functions and better display effects. Most of the existing LED drivers adopt unidirectional transmission control technology, as shown in fig. 1, a controller sends control instructions and data to an LED driving chip, and the LED driving chip realizes control actions according to requirements. Status and fault information of the LEDs and the driver chips are difficult to transmit back to the controller. For the controller, the LED driving system is a black box, and lack of intelligence. This adds difficulty and cost to display effect optimization and display screen maintenance. The prior art document with the application number of 201310476846.8 provides a scheme for realizing data return by adding a data return circuit and a termination circuit on a lamp panel, which additionally adds more PCB wiring and control circuits, thereby not only increasing the complexity of the lamp panel, but also increasing the cost and having great popularization difficulty. Some chips may use the 4-wire SPI protocol to implement data backhaul, but this increases the number of signal wires and is not compatible with existing LED driving signals, which also increases wiring difficulty and increases cost.
Fig. 2 is a circuit diagram of a prior art LED display system, wherein the LED driving system is also referred to as a lamp panel, and the controller may be a set of control systems including a computer, a transmitting card and a receiving card, or may be a control unit of a single microcontroller system. When the LED driving system receives the control signal of the controller, the signal is buffered by the buffer. The buffer is usually an 8-channel tri-state bus transceiver 74HC245, which can bidirectionally transmit data, and has a control terminal for controlling the direction of data transmission, wherein the control terminal is usually connected with power or ground in the prior art, i.e. the buffer is set to only unidirectionally transmit data. The signals of the controller are distributed to the scanning control chip and the LED driving chip after passing through the buffer of the LED driving system. And the scanning control chip and the LED driving chip perform corresponding work according to the received signals.
At present, along with the use of LED display in a short-distance display occasion, the requirement on the display effect of the LED is higher and higher, especially, the mini LED (sub-millimeter light emitting diode) display driving needs to be correspondingly controlled by a controller according to the specific LED driving chip state, so that the LED display effect and energy consumption can be optimized. Meanwhile, in some occasions with severe application environments, the controller is required to know the fault information of the LED lamp beads at any time. However, this function cannot be simply achieved in the prior art, and thus improvement is demanded.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a data return control method of an LED display system, which realizes the data return function on the basis of not adding additional components.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a data feedback control method of an LED display system is used for enabling an LED driving system to feedback data to a controller, configuring a buffer connected with a serial data input SDI port of the LED driving system as a bidirectional buffer, configuring a bidirectional transmission control port by the controller, and configuring a signal line to connect the bidirectional transmission control port with a data direction pin DIR port of the bidirectional buffer;
the method comprises the following steps:
s10, the controller adjusts the signal level of the bidirectional transmission control port to enable the data transmission directions of the bidirectional buffers to be opposite;
s20, the controller sends a data return instruction, the LED driving chip is switched to a data return state, and information data of the LED driving chip is transmitted back to the controller through a serial data input SDI port and a bidirectional buffer through continuous transmission of a data clock DCLK signal and a latch LE signal, so that a data return function is realized.
Specifically, in the step S20, the switching of the LED driving chip to the data backhaul state is to control the serial data output SDO port of the LED driving chip to be switched to the input port, and the serial data input SDI port to be switched to the output port.
Further, the parameters of the LED driving chip are configured with a data backhaul state and a data upload state, and the step S20 of implementing the data backhaul function includes:
s21, the controller sends a data return instruction;
s22, the LED driving chip decodes the instruction, configures the data return state to allow data return, and switches the serial data output SDO port of the data return state to an input port;
s23, configuring a data uploading state to allow data uploading according to a decoding instruction, and switching serial data input SDI ports of the data uploading state to output ports;
s24, information data of the LED driving chip are transmitted to the bidirectional buffer through the serial data input SDI port and are transmitted back to the controller.
The LED display system data feedback control method further comprises the following steps:
s25, the controller sends out a data return ending instruction, the LED driving chip decodes the instruction, and the serial data output SDO port and the serial data input SDI port are restored to be normal by adjusting the data return state and the data uploading state.
Specifically, the controller sends a data return instruction when the LED driving system is idle.
Furthermore, the invention also provides a data feedback control method of the LED display system, which is used for transmitting data among all cascaded LED driving chips in the LED driving system, and comprises the following steps:
r10, the controller configures parameters for each LED driving chip, including a data return state and a data uploading state;
r20, the controller respectively sends data feedback instructions to each LED driving chip;
r30, decoding the instruction by the current LED driving chip, configuring the data return state of the current LED driving chip to allow data return, and switching the serial data output SDO port of the current LED driving chip to an input port for receiving information data returned by the subsequent LED driving chip;
r40, the current LED driving chip processes the received information data returned by the rear-stage LED driving chip according to the configuration requirement of the data returning instruction on the data uploading state;
r50, the controller sends out a data return ending instruction, the LED driving chip decodes the instruction, and the working state of the LED driving chip is recovered to be normal by adjusting the data return state and the data uploading state.
Specifically, the step R40 includes:
r41, when the data uploading state is configured to allow data uploading, the current LED driving chip switches the serial data input SDI port of the current LED driving chip into an output port, and is used for transmitting information data of the current LED driving chip and information data returned by the subsequent LED driving chip to the previous LED driving chip;
r42, when the data uploading state is configured to not allow data uploading, the current LED driving chip receives information data returned by the later LED driving chip through the serial data output SDO port.
Specifically, when data is transmitted between the LED driving chips in the steps R30 and R40, the front-stage LED driving chip receives the information data transmitted back by the rear-stage LED driving chip through the serial data input SDI port bit by bit according to the DCLK signal through the serial data output SDO port by continuously transmitting the DCLK signal and the latch LE signal.
Further, the controller sends a data return instruction when the LED driving system is idle.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the invention, the input/output ports of the LED driving chips are respectively switched in input/output through the instructions on the basis of only adjusting one PCB wiring, so that the chip data information can be reversely transmitted back to the controller, the control state information and fault information of the LED driving system are effectively and cost-effectively returned, and the improvement of the performance of the LED display system and the convenience for later maintenance are facilitated.
(2) The invention can also realize data communication among a plurality of LED driving chips, and the state of the input/output ports of the LED driving chips is switched by utilizing the instruction, so that the data among the chips is effectively and reversely transmitted with low cost, the LED driving chips are convenient for coordinated control, the display driving is optimized, and the display effect presented in a large display system such as an 8k display screen is better.
Drawings
Fig. 1 is a functional block diagram of a prior art LED display system.
Fig. 2 is a schematic circuit diagram of a prior art LED display system.
Fig. 3 is a schematic flow chart of an implementation of an embodiment of the present invention.
Fig. 4 is a schematic diagram of a data feedback control circuit of an LED display system according to an embodiment of the present invention.
Fig. 5 is a flow chart of a control method in an embodiment of the invention.
FIG. 6 is a schematic diagram of a data backhaul circuit according to an embodiment of the present invention.
Detailed Description
The invention will now be further described with reference to the accompanying drawings and examples, embodiments of which include, but are not limited to, the following examples.
Example 1
As shown in fig. 3 to 5, the method for controlling data feedback of an LED display system according to the present embodiment is mainly used for the LED driving system to feedback data to the controller, and configures a buffer connected to a serial data input SDI port of the LED driving system as a bidirectional buffer in accordance with simple adjustment of a system circuit, and the controller configures a bidirectional transmission control port and configures a signal line to connect the bidirectional transmission control port and a data direction pin DIR port of the bidirectional buffer; other signals such as the data clock DCLK signal, the latch LE signal, and the scan driver chip signal still employ a buffer with unidirectional buffering function.
During normal operation, the LED driving system receives display data sent by the controller through SDI and DCLK signals, converts the display data into PWM LED driving signals according to requirements and outputs the PWM LED driving signals, and simultaneously scans and drives signals of the same receiving controller, and realizes scanning signal output according to requirements, so that normal picture display can be realized.
When the controller needs the LED driving system to carry out data feedback, the LED display system data feedback control method is realized according to the following steps:
s10, the controller adjusts the signal level of the bidirectional transmission control port to enable the data transmission directions of the bidirectional buffers to be opposite;
s20, the controller sends a data return instruction, the LED driving chip is switched to a data return state, and information data of the LED driving chip is transmitted back to the controller through a serial data input SDI port and a bidirectional buffer through continuous transmission of a data clock DCLK signal and a latch LE signal, so that a data return function is realized.
The LED driving chip is switched to a data return state, wherein the serial data output SDO port of the LED driving chip is controlled to be switched to an input port, and the serial data input SDI port is controlled to be switched to an output port.
Compared with the existing LED display system, the LED display system is characterized in that only a bidirectional transmission control end is LED out of the LED drive system, the LED drive system is slightly changed, and a signal wire of the bidirectional transmission control end added between the controller and the LED drive system is changed by only one flat cable, so that the LED display system is easy to realize; even with off-the-shelf spare signal lines, without the need to modify the flat cable.
More specifically, the parameters of the LED driver chips are configured with a data backhaul state and a data upload state, and the parameter configuration is preset based on the LED driver chips and each LED driver chip is configured by the controller when the system is powered on. The data feedback state can set whether the chip allows data feedback or not, and is mainly used for receiving data fed back by the post-stage LED driving chip, and the data uploading state can set whether the chip allows data uploading or not, and is mainly used for transmitting the data of the chip and the data fed back by the post-stage chip back to the controller.
The step S20 of implementing the data backhaul function includes:
s21, the controller sends a data return instruction; the controller sends a data feedback instruction when the LED driving system is idle;
s22, the LED driving chip decodes the instruction, configures the data return state to allow data return, and switches the serial data output SDO port of the data return state to an input port;
s23, configuring a data uploading state to allow data uploading according to a decoding instruction, and switching serial data input SDI ports of the data uploading state to output ports;
s24, information data of the LED driving chip are transmitted to the bidirectional buffer through the serial data input SDI port and are transmitted back to the controller.
S25, the controller sends out a data return ending instruction, the LED driving chip decodes the instruction, and the serial data output SDO port and the serial data input SDI port are restored to be normal by adjusting the data return state and the data uploading state.
In the prior art, the data transmission conflict can be generated in the process, the buffer in the prior circuit is in unidirectional buffer, data can be output to the SDI of the LED driving chip 1, the data can be in conflict with the output of the buffer, and abnormal large current is generated. After the invention is used for optimizing the configuration of the circuit, the problem is completely avoided. When the LED display system works normally, serial data is input into the SDI port, the data clock DCLK and the latch signal LE to transmit data in a small amount at full load, more idle time exists when the LED display is driven, at this time, the controller can send out a data feedback instruction, and each LED driving chip can feedback control information, such as chip temperature information, port voltage information, LED open-circuit information and the like, so that the controller can know the running state of the LED display system in real time.
After receiving the data return instruction, the LED driving chip decodes and configures a status register of the chip, the Serial Data Output (SDO) port of the control chip is switched to an input port, the Data Clock (DCLK) continuously transmits clock pulses, and the Serial Data Output (SDO) receives return data bit by bit according to the DCLK clock signals. The LED driving chip can also receive corresponding instruction information to carry out specific operation processing on the returned data. If data upload is allowed, serial data input SDI port synchronized serial bitwise output data. If the data is not allowed to be uploaded, the chip temporarily stores and processes the uploaded data according to the instruction. Until the controller sends out the end data return instruction. After receiving the end data return instruction, the LED driving chip restores the serial data input SDI port to an input port, and simultaneously restores the serial data output end SDO to an output port. And the LED driving chip is restored to a normal working state of receiving data for display driving.
As shown in fig. 6, this embodiment also provides a schematic illustration of the data backhaul circuit. The input port has a data clock DCLK and a latch signal LE, and the switchable input/output port has a serial data input SDI and a serial data output SDO. The data clock DCLK and the latch signal LE are output to the instruction decoder after passing through the input buffers U2 and U13, the instruction decoder outputs to the status register, and the status register outputs the data return enable ENa, the data upload enable EN1 and the data return control EN2. The function of the method is to configure the working state of the chip after the chip is powered on, if the data is allowed to pass back, enable ENa to be logic 1, otherwise enable ENa to be a default logic 0. And whether each chip allows data uploading or not is respectively set according to the requirements, if the data uploading is allowed, EN1 is enabled to be logic 1, otherwise EN1 is enabled to be logic 0 with a default value. The chip can also adjust the logic values of the data return enable ENa and the data upload enable EN1 in the working process. If the chip receives a data return instruction in the working process, the data return control EN2 is set to logic 1, at this time, since the chip data return enable ENa is already logic 1 in advance, the ENa and EN2 output logic 1 level to the alternative selector U3 after passing through the AND logic gate U8, and the output of the buffer U4 is selected as the output of the selector U3. Meanwhile, the output of the AND logic gate U8 is connected to the OR logic gate U7 and the inverter U6, or the OR logic gate U7 outputs a high level to close the P-type field effect transistor P1, the inverter U6 outputs a low level to the AND logic gate U5, and the AND logic gate U5 outputs a low level to close the N-type field effect transistor N1. That is, the output pipes P1 and N1 are closed after the ENa and EN2 are at the logic 1 level, and the SDO output is in the input state of high resistance.
The input of the SDO is output to the selector U3 after passing through the buffer U4 and then to the input end D of the D flip-flop D1, and each DCLK pulse arrives to shift the data of the SDO into the D flip-flop. The clock signals of the D triggers D1, D2 and Dn are uniformly connected to the output end of the buffer U2, the input and the output are sequentially connected to form an n-bit shift register, and each clock signal DCLK, data move one bit in the n-bit shift register, so that the data uploaded by the SDO are moved into the n-bit shift register, and the receiving function of data uploading is realized. Meanwhile, if the data upload enable EN1 is at a logic 1 level, the nand gate U9 outputs a logic 0 level to the or gate U12 and the inverter U10, the inverter U10 outputs a high level to the and gate U11, and the and gate U11 outputs a low level to turn off the N-type field effect transistor N2. The or logic gate U12 and the and logic gate U11 both allow the data of the D flip-flop Dn to pass through, for example, the Q terminal of Dn outputs a logic 1 level, and after passing through the inverter U14, the inverter U14 outputs a logic 0 level to the or logic gate U12 and the and logic gate U11, or the logic 0 level output by the or logic gate U12 opens the P-type field effect transistor P2, and the logic 0 level output by the and logic gate U5 closes the N-type field effect transistor N2, so that the P2 pulls the SDI to a logic 1 level. If Dn outputs a logic 0 level and then outputs a logic 1 level through the inverter U14, the or gate U12 and the and gate U11 both output a logic 1 level. Or the logic 1 level output by the logic gate U12 turns off the P-type field effect transistor P2, and the logic 1 level output by the logic gate U11 turns on the N-type field effect transistor N2, so that the N2 pulls the SDI to the logic 0 level. Therefore, the ENa signal and the EN1 signal are both in logic 1 level, so that the data of the D flip-flop Dn is output from the SDI, and the SDI of the current chip is connected to the SDO or the bidirectional buffer of the previous stage LED driving chip, thereby realizing the transmission of the data to the previous stage chip and the data uploading function.
When the data uploading is not allowed, EN1 is at logic 0 level, NAND gate U9 outputs logic 1 level, OR gate U12 outputs high level to close P-type field effect transistor P2, AND gate U11 outputs logic 0 level to close N-type field effect transistor N2, and SDI is still in the input state of high resistance. But at this time the selector U3 selects the input of the buffer U4 as the output, in the received data return state, the SDI is disabled via the input of the buffer U1.
Example 2
The data feedback control method of the LED display system is mainly used for transmitting data among the cascaded LED driving chips in the LED driving system, at the moment, the data feedback control method can be directly applied to the existing LED display system shown in fig. 2 without changing the existing system, communication among the LED driving chips can be realized without returning information of the LED driving system to a controller, and information of the rear-stage LED driving chips is returned to a front-stage, so that data processing among the chips is better realized, and the LED driving system achieves a more intelligent function.
The LED display system data feedback control method comprises the following steps:
r10, the controller configures parameters for each LED driving chip, including a data return state and a data uploading state. The data backhaul state specifically includes whether to allow the data backhaul function and whether to turn on the data backhaul function, wherein whether to allow the data backhaul function can set whether to allow the data backhaul by the chip, and can be configured as allowing the data backhaul by default, whether to turn on the data backhaul function for specifically configuring whether to use the data backhaul function, and both together constitute two cases of allowing the data backhaul and not allowing the data backhaul in the data backhaul state. The data uploading state is mainly used for specifically configuring whether serial data of the chip is allowed to be input into the SDI port to output data, uploading the data, if yes, uploading (forward-stage) the data of the chip through the SDI port, and forwarding the received data returned by the rear-stage chip to realize serial data return of the LED driving chip, and if no, the SDI port of the chip does not output the data, but can accept the returned data.
R20, the controller respectively sends data feedback instructions to each LED driving chip; and the controller sends a data feedback instruction when the LED driving system is idle.
R30, the current LED driving chip decodes the instruction, configures the data return state to allow data return, and switches the serial data output SDO port of the current LED driving chip to an input port for receiving information data returned by the subsequent LED driving chip.
And R40, the current LED driving chip processes the received information data returned by the rear-stage LED driving chip according to the configuration requirement of the data return instruction on the data uploading state.
R41, when the data uploading state is configured to allow data uploading, the current LED driving chip switches the serial data input SDI port of the current LED driving chip into an output port, and is used for transmitting information data of the current LED driving chip and information data returned by the subsequent LED driving chip to the previous LED driving chip;
r42, when the data uploading state is configured to not allow data uploading, the current LED driving chip receives information data returned by the later LED driving chip through the serial data output SDO port.
R50, the controller sends out a data return ending instruction, the LED driving chip decodes the instruction, and the working state of the LED driving chip is recovered to be normal by adjusting the data return state and the data uploading state.
Specifically, when data is transmitted between the LED driving chips in the steps R30 and R40, the front-stage LED driving chip receives the information data transmitted back by the rear-stage LED driving chip through the serial data input SDI port bit by bit according to the DCLK signal through the serial data output SDO port by continuously transmitting the DCLK signal and the latch LE signal.
Through the arrangement, data can be reversely transmitted among the LED driving chips, the data return function is realized effectively at low cost, the LED driving chips are convenient to coordinate and control, and the display driving is optimized, so that the LED display device is particularly practical in a large display system such as an 8k display screen.
The above embodiments are only preferred embodiments of the present invention, and not intended to limit the scope of the present invention, but all changes made by adopting the design principle of the present invention and performing non-creative work on the basis thereof shall fall within the scope of the present invention.
Claims (5)
1. The data feedback control method for the LED display system is characterized in that the buffer connected with the serial data input SDI port of the LED drive system is configured as a bidirectional buffer, the controller is configured with a bidirectional transmission control port, and a signal line is configured to connect the bidirectional transmission control port with a data direction pin DIR port of the bidirectional buffer;
the method comprises the following steps:
s10, the controller adjusts the signal level of the bidirectional transmission control port to enable the data transmission directions of the bidirectional buffers to be opposite;
s20, the controller sends a data return instruction, the LED driving chip is switched to a data return state, and information data of the LED driving chip is transmitted back to the controller through a serial data input SDI port through a bidirectional buffer by continuous sending of a data clock DCLK signal and a latch LE signal, so that a data return function is realized;
the parameters of the LED driving chip are configured with a data backhaul state and a data upload state, and the step S20 of implementing the data backhaul function includes:
s21, the controller sends a data return instruction;
s22, the LED driving chip decodes the instruction, configures the data return state to allow data return, and switches the serial data output SDO port of the data return state to an input port;
s23, configuring a data uploading state to allow data uploading according to a decoding instruction, and switching serial data input SDI ports of the data uploading state to output ports;
s24, information data of the LED driving chip are transmitted to the bidirectional buffer through the serial data input SDI port and are transmitted back to the controller;
s25, the controller sends out a data return ending instruction, the LED driving chip decodes the instruction, and the serial data output SDO port and the serial data input SDI port are restored to be normal by adjusting the data return state and the data uploading state.
2. The method according to claim 1, wherein the step S20 is to switch the LED driving chip to the data backhaul state to control the serial data output SDO port of the LED driving chip to be the input port and the serial data input SDI port to be the output port.
3. The method according to any one of claims 1-2, wherein the controller sends the data backhaul command when the LED driving system is idle.
4. The data feedback control method for the LED display system is characterized by being used for transmitting data among all cascaded LED driving chips in an LED driving system and comprising the following steps of:
r10, the controller configures parameters for each LED driving chip, including a data return state and a data uploading state;
r20, the controller respectively sends data feedback instructions to each LED driving chip;
r30, decoding the instruction by the current LED driving chip, configuring the data return state of the current LED driving chip to allow data return, and switching the serial data output SDO port of the current LED driving chip to an input port for receiving information data returned by the subsequent LED driving chip;
r40, the current LED driving chip processes the received information data returned by the rear LED driving chip according to the configuration requirement of the data returning instruction on the data uploading state:
r41, when the data uploading state is configured to allow data uploading, the current LED driving chip switches the serial data input SDI port of the current LED driving chip into an output port, and is used for transmitting information data of the current LED driving chip and information data returned by the subsequent LED driving chip to the previous LED driving chip;
r42, when the data uploading state is configured to not allow data uploading, the current LED driving chip receives information data returned by the rear-stage LED driving chip through a Serial Data Output (SDO) port of the current LED driving chip;
r50, the controller sends out a data return ending instruction, the LED driving chip decodes the instruction, and the working state of the LED driving chip is restored to be normal by adjusting the data return state and the data uploading state;
when data are transmitted between the LED driving chips in the steps R30 and R40, the front LED driving chip receives information data transmitted back by the rear LED driving chip through the serial data input SDI port bit by bit according to the DCLK signal through the serial data output SDO port through the continuous transmission of the DCLK signal and the latch LE signal.
5. The method of claim 4, wherein the controller sends the data backhaul command when the LED driving system is idle.
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| CN116884358B (en) * | 2023-09-05 | 2023-11-17 | 中科(深圳)无线半导体有限公司 | Mini LED driving chip capable of realizing single-sided wiring and backlight system |
| CN116863878B (en) * | 2023-09-05 | 2023-12-08 | 中科(深圳)无线半导体有限公司 | Double-line transmission method of mini LED system and chip structure for implementing double-line transmission method |
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